You can calculate gravitational potential energy by using what equation.

U = m*g*h

Explanation:

U = m*g*h

where U stands for gravitational potential energy, m is the mass of the object, g is the gravitational constant (9.8 in the SI system), and h is the high at which the object is lifted normally relative to ground level, where the zero of potential energy is defined.

We can calculate gravitational potential energy of an object by using the formula GPE =

Explanation:

Energy is neither created nor destroyed. There are various forms of energy which are converted from one form of energy to another form of energy. Gravitational potential energy is a form of energy when any object is at a height it possess gravitational potential energy.

We can calculate gravitational potential energy of an object which is at height from ground h and mass m by using the formula GPE = . Here, g is acceleration due to gravity = 9.81 .

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.